0 1 00:00:04,530 --> 00:00:05,363 Hello, everybody. 1 2 00:00:05,363 --> 00:00:06,870 In this section we are going to create 2 3 00:00:06,870 --> 00:00:08,190 a really, really nice application 3 4 00:00:08,190 --> 00:00:10,320 and it will be very informative. 4 5 00:00:10,320 --> 00:00:11,320 What is our application? 5 6 00:00:11,320 --> 00:00:15,210 It is an address book application and this is our main pages here. 6 7 00:00:15,210 --> 00:00:17,450 And what we are going to build , let me show it. 7 8 00:00:17,450 --> 00:00:19,800 For example, here this is our main page, right, 8 9 00:00:20,922 --> 00:00:23,620 and we are going to create three different buttons. 9 10 00:00:23,620 --> 00:00:24,810 And the first one is my people. 10 11 00:00:24,810 --> 00:00:27,400 If I click my people button, as you see now, 11 12 00:00:27,400 --> 00:00:30,670 here, this is my persons, this page. 12 13 00:00:30,670 --> 00:00:33,110 And by the way this is my main window. 13 14 00:00:33,110 --> 00:00:34,650 I will always keep this window. 14 15 00:00:34,650 --> 00:00:37,830 But for example, if I click another button here, 15 16 00:00:37,830 --> 00:00:41,747 you see I closed that my people window 16 17 00:00:41,747 --> 00:00:43,430 but I opened a new window. 17 18 00:00:43,430 --> 00:00:44,797 But I will keep my main window. 18 19 00:00:45,970 --> 00:00:46,903 This is important. 19 20 00:00:48,329 --> 00:00:50,020 And let me click it again. 20 21 00:00:50,020 --> 00:00:52,660 Here we have our persons, right? 21 22 00:00:52,660 --> 00:00:55,410 And here we are going to get all the persons 22 23 00:00:55,410 --> 00:00:56,950 from our database. 23 24 00:00:56,950 --> 00:00:58,900 Of course we are going to use a database 24 25 00:00:58,900 --> 00:01:02,120 for this application, and if I want to add new people, 25 26 00:01:02,120 --> 00:01:03,490 I will click add button. 26 27 00:01:03,490 --> 00:01:06,680 And here, let's fill it. 27 28 00:01:06,680 --> 00:01:09,023 And here I will say, for example, 28 29 00:01:10,070 --> 00:01:13,383 Katya, something like that, and surname's Black. 29 30 00:01:14,260 --> 00:01:19,260 And email, katya@gmail.com. 30 31 00:01:19,550 --> 00:01:22,100 And phone number, plus seven something like that, 31 32 00:01:22,100 --> 00:01:23,130 okay, doesn't matter. 32 33 00:01:23,130 --> 00:01:28,130 And here I will say Krasnodar, Russia. 33 34 00:01:29,160 --> 00:01:33,880 And if I say add button before I will cut this one. 34 35 00:01:33,880 --> 00:01:34,780 I want to show you something. 35 36 00:01:34,780 --> 00:01:37,960 And if I say add person, as you see it said 36 37 00:01:37,960 --> 00:01:40,270 fields can't be empty. 37 38 00:01:40,270 --> 00:01:43,630 Now what I need to do, I need to fill all areas here. 38 39 00:01:43,630 --> 00:01:46,900 And I will paste back my phone number. 39 40 00:01:46,900 --> 00:01:49,330 If I say add person, as you see now, 40 41 00:01:49,330 --> 00:01:52,920 our person has been added to our database. 41 42 00:01:52,920 --> 00:01:56,250 And now let's go back to our my people. 42 43 00:01:56,250 --> 00:01:57,530 And if I click my people, 43 44 00:01:57,530 --> 00:01:59,470 as you see, Katya Black is here. 44 45 00:01:59,470 --> 00:02:01,220 Of course we can also update it, 45 46 00:02:01,220 --> 00:02:02,233 and now how can I do it? 46 47 00:02:02,233 --> 00:02:06,410 I'll say, Katya, update. 47 48 00:02:06,410 --> 00:02:09,510 Here I will say for example, Olga 48 49 00:02:09,510 --> 00:02:10,780 instead of Katya. 49 50 00:02:10,780 --> 00:02:15,280 And of course we can update all areas here. 50 51 00:02:15,280 --> 00:02:19,580 And here let's say, for example, Moscow, Russia. 51 52 00:02:19,580 --> 00:02:22,050 And let's say update person. 52 53 00:02:22,050 --> 00:02:23,973 As you see, person has been updated. 53 54 00:02:25,000 --> 00:02:28,590 And other thing about our application, 54 55 00:02:28,590 --> 00:02:31,270 now we saw how we can use add and update. 55 56 00:02:31,270 --> 00:02:35,550 Also let's learn how we can use display button. 56 57 00:02:35,550 --> 00:02:37,060 I say display. 57 58 00:02:37,060 --> 00:02:39,180 As you see now, display is here. 58 59 00:02:39,180 --> 00:02:42,430 Let me, again, that one. 59 60 00:02:42,430 --> 00:02:44,350 Mary Brown, display. 60 61 00:02:44,350 --> 00:02:47,830 And here our fields, we cannot edit these fields. 61 62 00:02:47,830 --> 00:02:48,663 This is important. 62 63 00:02:48,663 --> 00:02:52,800 I want to show you how we can create entries 63 64 00:02:52,800 --> 00:02:54,980 or text areas, a text widget, 64 65 00:02:54,980 --> 00:02:56,420 and we can use it, 65 66 00:02:56,420 --> 00:02:59,645 users cannot edit these areas. 66 67 00:02:59,645 --> 00:03:01,230 And as you see, we don't have a button here 67 68 00:03:01,230 --> 00:03:03,410 because we only display our person. 68 69 00:03:03,410 --> 00:03:06,760 And after also we have delete button. 69 70 00:03:06,760 --> 00:03:08,230 And I will click delete button. 70 71 00:03:08,230 --> 00:03:10,830 As you see, it said are you sure to delete this person? 71 72 00:03:10,830 --> 00:03:12,390 I will say no. 72 73 00:03:12,390 --> 00:03:15,953 You see, nothing happens but if I say here, 73 74 00:03:17,380 --> 00:03:21,750 delete, and yes, and person has been deleted. 74 75 00:03:21,750 --> 00:03:23,660 If I go back to my people 75 76 00:03:23,660 --> 00:03:25,810 and I close my window, by the way, 76 77 00:03:25,810 --> 00:03:28,680 and go, as you see now, 77 78 00:03:28,680 --> 00:03:31,010 Olga, her name was Olga, right? 78 79 00:03:31,010 --> 00:03:31,910 Olga is not here. 79 80 00:03:31,910 --> 00:03:36,420 Let's also try to delete this one, Mary. 80 81 00:03:36,420 --> 00:03:37,783 Delete, yes. 81 82 00:03:38,960 --> 00:03:40,680 And if I go back to my people, 82 83 00:03:40,680 --> 00:03:42,953 as you see, Mary also is not here anymore. 83 84 00:03:44,560 --> 00:03:45,393 What is next? 84 85 00:03:45,393 --> 00:03:47,585 Also I want to talk about here the other buttons. 85 86 00:03:47,585 --> 00:03:50,090 Add people is same. 86 87 00:03:50,090 --> 00:03:53,480 Now it's like quick, a shortcut for add people. 87 88 00:03:53,480 --> 00:03:57,520 And the other one is about us window. 88 89 00:03:57,520 --> 00:04:00,587 As you see now, it's very simple about us window. 89 90 00:04:01,540 --> 00:04:03,380 Just we have a text here. 90 91 00:04:03,380 --> 00:04:05,550 What is important about our application, 91 92 00:04:05,550 --> 00:04:08,320 let me introduce it, let me tell you something. 92 93 00:04:08,320 --> 00:04:11,720 Now with this application we are going to learn 93 94 00:04:11,720 --> 00:04:15,290 how we can work with multiple python files. 94 95 00:04:15,290 --> 00:04:16,123 What I mean? 95 96 00:04:16,123 --> 00:04:20,890 Here, we will create different four python files, 96 97 00:04:20,890 --> 00:04:23,440 not only one, because if you want to create 97 98 00:04:23,440 --> 00:04:26,860 professional applications, if you want to be 98 99 00:04:26,860 --> 00:04:28,600 a really professional developer, 99 100 00:04:28,600 --> 00:04:31,770 you need to use multiple files for your projects. 100 101 00:04:31,770 --> 00:04:34,690 Only one file is not enough and it's not good, 101 102 00:04:34,690 --> 00:04:37,060 and it's not pythonic way. 102 103 00:04:37,060 --> 00:04:39,250 So I will try to show you with this application 103 104 00:04:39,250 --> 00:04:44,030 how you can use multiple python files for our application, 104 105 00:04:44,030 --> 00:04:46,900 and of course we are going to use a database 105 106 00:04:46,900 --> 00:04:50,280 and we will get all the values from database 106 107 00:04:50,280 --> 00:04:53,923 and we will add our persons to our database. 107 108 00:04:54,885 --> 00:04:56,950 This also very important. 108 109 00:04:56,950 --> 00:04:58,860 As I said, it's very, very useful, 109 110 00:04:58,860 --> 00:05:00,940 and very, very informative lesson, 110 111 00:05:00,940 --> 00:05:02,920 informative section, actually, 111 112 00:05:02,920 --> 00:05:07,680 because I think we will almost two hours, 112 113 00:05:07,680 --> 00:05:12,680 we will make the lessons for this application. 113 114 00:05:12,870 --> 00:05:14,730 And I hope you will learn many things. 114 115 00:05:14,730 --> 00:05:15,930 For now, that's all. 115 116 00:05:15,930 --> 00:05:16,930 See you in the next.